W3C home > Mailing lists > Public > public-device-apis@w3.org > November 2011

RE: Battery Status API Last Call Feedback

From: Josh Soref <jsoref@rim.com>
Date: Tue, 29 Nov 2011 17:11:11 +0000
To: "public-device-apis@w3.org" <public-device-apis@w3.org>
Message-ID: <957F1ECDA90E004B8DBDE23CFC94E3A31164B5BB@XMB103ECNC.rim.net>
Mounir wrote:
> With the current state of the spec, the only privacy issue is quite
> minor: a website can know if you are currently running in battery mode which
> means not plugged. The only usage I can imagine of that information is a
> website trying to suck your power out. Even, such website can exist today and
> the only new information given is whether it is worth trying or not.

This isn't accurate.

In theory a web site could play a video and calculate how much energy a video costs. Then it could monitor battery and calculate when you're watching videos.

It'd be fairly rough, but if you can calculate that 1% normally takes say 30 minutes to consume, and that you can consume 1% in say 4 minutes by watching a video, then if you see 1% consumed in 4 minutes, you can guess someone was playing a video.

It could probably do similar things to calculate the cost of using GPS and then use it to determine when GPS might have been used.

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Received on Tuesday, 29 November 2011 17:11:44 UTC

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